JPS59225946A - Manufacture of winding body for both-surface exfoliating paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves scattering fine powder between the release agent layers that come into contact when winding up double-sided release paper in which silicone-based release agent layers are formed on both sides of a base material to provide different release forces. This relates to a method for manufacturing a roll of double-sided release paper, which is characterized in that uncured release agents forming silicone-based release agent layers having different release forces that are in contact with each other transfer to each other. This prevents the peeling force of both peeling agent layers from becoming uniform over time,
The initial peeling force of both release agent layers can be maintained, and the rolled body can be stored for a long period of time.

Conventionally available rolls of double-sided release paper with release agent layers with different release forces formed on both sides do not allow the uncured release agent of the contacting release agent layers with different release forces to migrate. before the peeling force becomes uniform.

For example, processing such as applying an adhesive is performed within 2 () days after manufacturing, or the applied release agent is
Heat treatment must be performed at 0C for 0.1 to 2°0 minutes, and in the former case, the distribution mechanism is a problem, and in the latter case, it cannot be applied especially when a synthetic resin film is used as the base material. However, as a result of various experimental studies, the present inventors have obtained the present invention which does not have these drawbacks.

Examples of the present invention will be described below with reference to the drawings.
300g/W? A polyolefin-based synthetic resin film 2 such as polyethylene or polypropylene with a thickness of 5 to 30 μm is coated on both sides of a paper material 1 such as kraft paper, high-quality paper, glassine paper, parchment paper, stretchable kraft paper, etc., using an extrusion film-forming machine. The difference in peel force on both sides of the formed base material 3 is at least 5
The release agent layer 4 with a large release force and the release agent layer 5 with a small release force were set to 0g15σ, and the additive silicone release agent was 0g.
．． 1-1.0g/- applied, 50-200 U, 0
．． Heat treatment was performed for 1 to 3.0 minutes to volatilize the solvent to form double-sided release paper 6, and when winding up double-sided release paper 6, it was treated with silica having a particle size of 5 μm or less using an appropriate device such as an electrostatic coating device. Fine powder such as starch or metal oxide is dispersed at 0.01 to 0.1 g/m' onto the release agent layer 4 or 5 and wound while forming a fine powder layer 7 to form a rolled body 8. be.

The above-mentioned rolled body 8 is packaged, stored and distributed,
At a processing company, an adhesive layer 9 made of a suitable adhesive such as rubber-based or acrylic-based adhesive is applied to the release agent layer 4 while unwinding the roll 8.
Alternatively, the pressure-sensitive adhesive roll 10 is obtained by coating 5-A to a thickness of 30 to 500 μm and then winding it up again.

When the adhesive roll 10 is rewound, it is pulled out while adhering to the release agent layer 4 of the double-sided release paper 6, which has a large peeling force, and is pulled out from the release agent layer 5, which has a small peeling force, and sticks to the surface to be adhered. layer 9
After adhesion, the double-sided release paper 6 is peeled off to expose the adhesive layer 9, and the object to be adhered is adhered.

The present invention is characterized in that when winding up double-sided release paper in which silicone-based release agent layers with different release forces are formed on both sides of a base material, fine powder is sprinkled between the release agent layers that come into contact with each other. This is a method for manufacturing a roll of double-sided release paper, in which an uncured release agent forming silicone-based release agent layers 4 and 5 having different release forces that are in contact is formed between both release agent layers 4 and 5. The fine powder layer 7 prevents mutual migration, prevents the release force of both release agent layers 4 and 5 from becoming uniform over time, and maintains the initial release force of both release agent layers 4 and 5. This allows the roll 8 to be stored for a long period of time.

Next, a manufacturing example of the present invention will be shown.

Basis weight 75g/fr? Polyethylene resin layers with a thickness of 20μ are laminated on both sides of kraft paper using an extrusion lamination method, and one side is coated with additive silicone resin (KS-779F manufactured by Shin-Etsu Chemical Co., Ltd.).
0, esg/m'' as a solid content, and dried in an oven at 120C, and then coated with another addition type silicone resin (Toray, 5RX-2 manufactured by Silicone Co., Ltd.) on the other side.
11 or less) as solid content o, 6sg/n/
After coating and drying in the open at 120C, an average particle size of 7. 0.05 g/i of θμ silica-treated starch was applied by electrostatic coating and wound. The peeling force of sides A and B immediately after winding was measured using the offset method and was 50m1.
The width was 22g and 63g, respectively. A due to time
The following table shows the peeling forces of sides A and B, and the peeling forces of sides A' and 37, which are not coated with silica-treated starch, as comparative examples.

Indicates separation.

Side B, side 37: Shows the overprinted surfaces of the present invention example and comparative example, respectively.

Figure 1 is a partial cross-sectional view of the rolled body, Figure 2 is a partially enlarged cross-sectional view of the rolled body, Figure 3 is a graph of the peeling force curve of the two release agent layers, and Figure 4 is a graph of the peeling force curve of the two release agent layers. The figure is a partially enlarged sectional view of the adhesive roll.

3... Base material, 4,5... Release agent layer, 6.-
・Double-sided release paper, 7... Fine powder layer Applicant Fujimori Kogyo Co., Ltd. Agent Mutsumi Nozawa Aki 7.7)

Claims (4)

[Claims] (1) Double-sided release paper, in which a silicone-based release agent layer with different release forces is formed on both sides of the base material, is rolled up, and fine powder is sprinkled between the release agent layers that come into contact with each other. A method for manufacturing a roll of release paper. (2) A method for producing a roll of double-sided release paper according to claim 1, characterized in that the base material is a paper material with polyolefin-based synthetic resin films formed on both sides of the paper material. (3) A double-sided release paper according to claim 1, characterized in that the release agent layer is formed by an addition-type silicone release agent, and the difference in release force between the release agent layers on both sides is 5.0 g 15 α or more. The manufacturing method of the rolled body. (4) 0.01 to 0.1 g/m' of fine powder made of silicate-treated starch and metal oxide having a particle size of 5 μm or less is sprinkled. A method for manufacturing a rolled body with peeling on both sides.